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Primary root length (mm, A), lateral root number (number root−1, B) and lateral root density (number mm−1, C) in 7-day-old Col-0, GSNOR- and SL mutant Arabidopsis lines grown during stress-free conditions. Different letters indicate significant differences according to Duncan's test (n = 60, P ≤ 0.05). (D) Representative photographs taken from 7-day-old Arabidopsis seedlings of different mutant lines grown on ½ MS medium. Bars = 1 cm.
